How to force the flowering of cannabis plants

Why and how to force the flowering of your cannabis plants in summer?

Growing outdoors can be tricky in terms of timing. And if you make a mistake or if your position simply does not allow you to let nature take its course, your harvest may be considerably reduced, or even nonexistent ... When we talk about forcing the flowering period, just flowering or the manipulation of the photoperiod is the same thing. So don't panic, but why and how to force flowering in the summer?

summer period, flowering

Forcing the flowering

Some plants measure the dark periods and the light periods of each day. They change their growth patterns based on this information. Namely, going from vegetative growth to floral growth. For most plants, the trigger for growing flowers, fruits, and seeds is the length of each day's dark period.

summer period, flowering

During the summer the day length is closer to the poles than the equator, a particular variety of marijuana blooms much earlier in Florida than in Vancouver. It begins to bloom when a critical dark period is reached. For most varieties this appears to be between 8 and 12 hours of uninterrupted darkness every day.

Why should I force flowering?

Forcing cannabis to flower is an easy way to get your outdoor or greenhouse grow to start flowering with enough time to complete its growth cycle. Especially before the winter cold sets in and the sunlight becomes weak and limited. The northern and cold temperate zones are in the northern hemisphere, and the corresponding southern zones are in the southern hemisphere.

summer period, flowering

The time between daylight hours that falls low enough for flowering to begin may be insufficient for complete flowering. Thus, artificially reducing daylight hours prematurely can provide the extra days needed for harvesting.

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When should I force flowering?

Forcing flowering outdoors depends a lot on your location. In temperate and tropical regions there is only a very short period each year when cannabis cannot be cultivated. This is so that the flowering cycles end before the cold or wet season is the only real requirement.

summer period, flowering

In cold temperature climates like the UK and the Netherlands or northern France, fall conditions usually become too cold and too humid to maintain healthy growth. These periods are included by the end of September to mid-October. So, to make sure your harvest finishes on time, it is advisable to start the light deprivation at mid-late July. (depending on the flowering time of the strain.)

Perpetual harvest

Forcing flowering can also be helpful for growers in more favorable climates. Especially for those who wish to produce several crops per year (a "perpetual harvest"). Some growers are able to harvest two or more crops per year by strategically depriving plants of light. For example, the plants can be launched in February or March. Some can be harvested in June using light deprivation techniques. While others may flower naturally in late summer and be ready to harvest by mid-fall.

summer period, flowering

Plants will put all their energy into a reproductive effort in preparation for the coming winter. Plants know when to do this by measuring the amount of darkness in each day. Evenings last longer in late summer and move into fall. At some point, plants instinctively know how to begin their reproductive efforts. It is exactly this response to the dark period that will give you control over flowering.

Recognize the critical light level of a plant

You can know the critical light level of a plant by observing them outdoors. This is to see when they start to bloom. Check the length of the dark period when you observe the first flowers. Inside you can start to 9 hours of darkness et increase the dark period of 15 minutes a week. Set a critical period of 15 minutes shorter than the length of the dark period when you see the first flowers.

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summer period, flowering

Suppose the critical dark period of a plant is 10 hours. This means that it will bloom under 14 hours of light a day. It is 2 more hours as the 12 hours light period which is generally recommended. The two hours of extra light each day are an increase of 16% of the light necessary. This is essential because the light = growth. A shorter dark period can prolong the flowering period a little. For the buds to ripen quickly, the dark period can be lengthened to 12 or even 14 hours.

Cover your plants

Once the natural hours of darkness increase to twelve or more hours per night, the need to cover your plants goes away and they can be left to the elements. You may want to continue to cover your plants if your crop is affected by light pollution (eg from streetlights), or if cold temperatures or weather conditions require it.

summer period, flowering

Therefore, one thing to keep in mind is that it is crucial to adhere to the lighting regime and not to miss each other, even on a day ... This so that the plants do not mix up the cycles, this that could make them revert to vegetative growth. If budget allows, investing in automation systems may be a possibility.


summer period, flowering

If you allow it, forced flowering cannabis can make the difference between a successful or a failed harvest… The yield can be noticeably taller, tighter, and more resinous if grown under this regime. This allows for increased yields in cold climates. Where the difference in temperature and light intensity between late summer and early fall is greatly felt.

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Tags : Agriculture / GrowPlanting

The author Weed-master

Weed media broadcaster and communications manager specializing in legal cannabis. Do you know what they say? knowledge is power. Understand the science behind cannabis medicine, while staying up to date with the latest health related research, treatments and products. Stay up to date with the latest news and ideas on legalization, laws, political movements. Discover tips, tricks and how-to guides from the most seasoned growers on the planet as well as the latest research and findings from the scientific community on the medical qualities of cannabis.